remove ctx, db stuff and use callbacks instead

update.go

@@ -1,7 +1,6 @@
 package sqimple
 
 import (
-	"context"
 	"database/sql"
 	"slices"
 	"strings"
@@ -9,8 +8,7 @@ import (
 
 // https://www.sqlite.org/lang_update.html
 type UpdateStatement struct {
-	Ctx context.Context
-	DB  *sql.DB
+	execFunc func(Query) (sql.Result, error)
 
 	table UpdateTable
 	or    string
@@ -37,15 +35,16 @@ func (s *UpdateStatement) Args() []any {
 }
 
 func (s *UpdateStatement) Exec() (sql.Result, error) {
-	if s.DB != nil {
-		if s.Ctx != nil {
-			return s.DB.ExecContext(s.Ctx, s.String(), s.Args()...)
-		}
-
-		return s.DB.Exec(s.String(), s.Args()...)
+	if s.execFunc != nil {
+		return s.execFunc(s)
 	}
 
-	return nil, ErrNoDatabase
+	return nil, nil
+}
+
+func (s *UpdateStatement) ExecFunc(f func(Query) (sql.Result, error)) *UpdateStatement {
+	s.execFunc = f
+	return s
 }
 
 func (s *UpdateStatement) IsValid() bool {